The most accurate and scientific is the kelvin scale and the SI unit of temperature and maybe their were different scales used in different countries but why use all three of them everywhere. Like we can use USA using miles while other countries use kilometer. But they both are not used at a single time at a single place. But why use 3 scales at once?
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In order to establish the Kelvin scale you first need to know what is the absolute zero temperature, and historically that took some time for scientists to determine with enough precision. By that time the other scales (including Celsius/centigrade) had already been established. Also the centigrade scale is quite convenient in that the water freezing temperature is 0 and the boiling temperature is 100. Fahrenheit scar doesn’t have anything to redeem it, in my opinion.
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